Paying for Telkoms errors

In the month of August, my payday was on a Saturday (25th). Telkom tried to debit my account on the the Friday (24th). They eventually took they payment on the 28th. When I called in today about an enquiry, I was was that I need to pay a penalty fee of R200 for “late payment “

Firstly, in my contract, it states that my amount is due on the 25th of every and they decided to go on a 24th Secondly, the amount was taken by them from my account and now I’m being told I paid late Thirdly, the money debit was apparently debited by they lawyers or third parties whatsoever so it doesn’t even reflect on there side

Help me understand why I’m having to pay penalty fees for Telkoms errors in billing my account